ALL PRIME S Series Instruction manual

1
INSTALLATION,
OPERATION
&
MAINTENANCE
MANUAL
with PARTS LIST
S Series Pumps Model
S-12
All Prime Pumps
a Division of Power & Pumps, Inc.
803 N. Myrtle Ave.
Jacksonville, FL 32204
phone: [phone]
phone: [phone]
fax: [phone]
e-mail: [email protected]
date: 07/2013

2
TABLE OF CONTENTS
INTRODUCTION . . . . . . . . . Pg. 04
SAFETY – SECTION A . . . . . . . . Pg. 05
INSTALLATION – SECTION B . . . . . . . Pg. 06
- Pump Dimensions . . . . . . . Pg. 06
PRE INSTALLATION INSPECTION . . . . . . Pg. 07
POSITIONING PUMP . . . . . . . Pg. 07
- Lifting . . . . . . . . Pg. 07
- Mounting . . . . . . . . Pg. 07
- Clearance . . . . . . . . Pg. 07
SUCTION AND DISCHARGE PIPING . . . . . Pg. 07
- Materials . . . . . . . . Pg. 07
- Line Configuration . . . . . . . Pg. 08
- Connections to Pump . . . . . . Pg. 08
- Gauges . . . . . . . . Pg. 08
SUCTION LINES . . . . . . . . Pg. 08
- Fittings . . . . . . . . Pg. 08
- Strainers . . . . . . . . Pg. 08
- Sealing . . . . . . . . Pg. 08
- Suction Lines in Sumps . . . . . . Pg. 08
- Suction Lines Positioning . . . . . . Pg. 09
DISCHARGE LINES . . . . . . . . Pg. 09
- Siphoning . . . . . . . . Pg. 09
- Valves . . . . . . . . Pg. 09
- Bypass Lines . . . . . . . Pg. 10
AUTOMATIC AIR RELEASE VALVE . . . . . . Pg. 11
- Theory of Operation . . . . . . Pg. 11
- Air Release Valve Installation . . . . . Pg. 11
ALIGNMENT . . . . . . . . . Pg. 12
- Coupled Drivers . . . . . . . Pg. 13
- V-Belt Drives . . . . . . . Pg. 14
OPERATION – SECTION C . . . . . . . . Pg. 15
PRIMING . . . . . . . . . Pg. 15
STARTING . . . . . . . . . Pg. 15
- Rotation . . . . . . . . Pg. 15
OPERATION . . . . . . . . . Pg. 16
- Lines With a Bypass . . . . . . Pg. 16
- Lines Without a Bypass . . . . . . Pg. 16
- Leakage . . . . . . . . Pg. 16
- Liquids Temperature and Overheating . . . . Pg. 16
- Strainer Check . . . . . . . Pg. 17
- Pump Vacuum Check . . . . . . Pg. 17
STOPPING . . . . . . . . . Pg. 17
- Cold Weather Preservation . . . . . Pg. 17
BEARING TEMPERATURE CHECK . . . . . . Pg. 18

3
TABLE OF CONTENTS
(Continued)
TROUBLESHOOTING – SECTION D . . . . . . Pg. 19
- Preventive Maintenance . . . . . . Pg. 21
PUMP MAINTENANCE AND REPAIR – SECTION E . . . . Pg. 22
- Performance Curve . . . . . . Pg. 22
- Parts List . . . . . . . . Pg. 23
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY . . . . Pg. 25
- Suction Check Valve Disassembly . . . . Pg. 25
- Pump Disassembly. . . . . . . Pg. 26
- Seal Disassembly . . . . . . . Pg. 27
- Shaft and Bearing Disassembly . . . . . Pg. 27
- Shaft and Bearing Reassembly . . . . . Pg. 28
- Seal Reassembly . . . . . . . Pg. 29
- Pump Reassembly . . . . . . . Pg. 30
- Suction Check Valve Reassembly . . . . Pg. 30
LUBRICATION . . . . . . . . . Pg. 31
- Seal Assembly . . . . . . . Pg. 31
- Bearings . . . . . . . . Pg. 32
WARRANTY STATEMENT . . . . . . . . Pg. 33

4
INTRODUCTION
This Installation, Operation, and Maintenance
manual is designed to help you get the best
performance and longest life from your All
Prime pump.
This pump is an S-Series, semi-open impeller,
self-priming centrifugal model with a suction
check valve.
The pump is designed for handling mild
industrial corrosives, mud or slurries containing
large entrained solids. The basic material
of construction is gray iron, with ductile iron
impeller and steel wearing parts.
If there are any questions regarding the pump
or its applications which are not covered in this
manual or in other literature accompanying this
unit, please contact your All Prime distributor,
or:
ALL PRIME PUMPS
803 N. Myrtle Ave.
Jacksonville, FL 32204
phone: [phone]
fax: [phone]
For information or technical assistance on the
power source, (i.e. - electric motor, engine,
etc.) contact the power source manufacture’s
local dealer or representative.
The following are used to alert maintenance
personnel to procedures which require special
attention, to those which could damage
equipment, and to those which could be
dangerous to personnel:
DANGER!
Immediate hazards which WILL result in severe
personal injury or death. These instructions
describe the procedure required and the
injury which will result from failure to follow
procedure.
CAUTION!
Hazards or unsafe practices which COULD
result in minor personal injury, product or
property damage. These instructions describe
the requirements and the possible damage
which could result from failure to follow the
procedure.
NOTE:
Instructions to aid in installation, operation,
and maintenance or which clarify a procedure.

5
SAFETY – SECTION A
These warnings apply to S-series basic pumps.
All Prime has no control over or particular
knowledge of the power source which will
be used. Refer to the manual accompanying
the power source before attempting to begin
operation.
WARNING!
Before attempting to open or service the
pump:
1. Familiarize yourself with this manual.
2. Disconnect or lock-out the power source
to ensure that the pump will remain
inoperative.
3. Allow the pump to cool if overheated.
4. Check the temperature before opening any
covers, plates, or plugs.
5. Close the suction and discharge valves.
6. Vent the pump slowly and cautiously.
7. Drain the pump
WARNING!
This pump is designed to handle mild industrial
corrosives, mud or slurries containing large
entrained solids. Do not attempt to pump
volatile, corrosive, or flammable materials
which may damage the pump or endanger
personnel as result of pump failure.
WARNING!
After the pump has been positioned, make
certainthatthepumpandallpipingconnections
are tight, properly supported and secure before
operation.
WARNING!
Do not operate the pump without the guards in
place over the rotating parts. Exposed rotating
parts can catch clothing, fingers, or tools,
causing severe injury to personnel.
WARNING!
Do not remove plates, covers, gauges, pipe
plugs, or fittings from an overheated pump.
Vapor pressure within the pump can cause
parts being disengaged to be ejected with
great force. Allow the pump to cool before
servicing.
WARNING!
Do not operate the pump against a closed
discharge valve for long periods of time. If
operated against a closed discharge valve,
pump components will deteriorate, and the
liquid could come to a boil, pressurize, and
cause the pump casing to rupture or explode.
WARNING!
Use lifting and moving equipment in good
repair and with adequate capacity to prevent
injuries to personnel or damage to equipment.
Suction & Discharge hoses and piping must be
removed before lifting.

6
INSTALLATION – SECTION B
Review all SAFETY information in Section A.
Since pump installations are seldom identical,
thissectionoffersonlygeneralrecommendations
and practices required to inspect, position and
arrange the pump and piping.
Most of the information pertains to a standard
static lift application where the pump is
positioned above the level of liquid to be
pumped.
If installed in a flooded suction application
where the liquid is supplied to the pump under
pressure, some of the information such as
mounting, line configuration, and priming must
be tailored to the specific application.
Figure 1. Pump Model S-12
Since the pressure supplied to the pump is
critical to performance and safety, be sure to
limitincomingpressureto50%of themaximum
permissible operating pressure as shown on
the pump performance curve.
For further assistance, contact your All Prime
distributor or All Prime Pumps.
Pump Dimensions
See Figure 1 below for the physical dimensions
of this pump.
OUTLINE DRAWING

7
The pump was inspected and tested before
shipping from the factory. Before installation,
inspect the pump for damage which may have
occurred during shipment. Check as follows:
a.Inspect the pump forcracks,dents, damaged
threads, and other obvious damage.
b. Check for and tighten loose attaching
hardware. Since gaskets tend to shrink after
drying, check for loose hardware at mating
surfaces.
c. Carefully read all warnings and cautions
contained in this manual or affixed to the
pump, and perform all duties indicated. Note
the direction of rotation indicated on the
pump. Check that the pump shaft rotates
counterclockwise when facing the back cover
plate assembly / impeller end of the pump.
CAUTION!
Only operate this pump in the direction indicate
by the arrow on the pump body and on the
accompanying decal. Refer to ROTATION in
OPERATION, Section C. (page 15)
d. Check levels and lubricate as necessary.
Refer to LUBRICATION in the MAINTENANCE
ANDREPAIRsectionofthismanualandperform
duties as instructed. (page 31)
e. If the pump and power source have been
stored for more than 12 months, some of the
components or lubricants may have exceeded
their maximum shelf life. These must be
inspected or replaced to ensure maximum
pump service.
If the maximum shelf life has been exceeded,
or if anything appears to be abnormal, contact
your All Prime distributor or the factory to
determine the repair or updating policy. Do
not put the pump into service until appropriate
action has been taken.
POSITIONING PUMP
Lifting
This pump weighs approximately 2200-pounds
not including the weight of any accessories,
base-frame, motor, etc. Use the proper lifting
equipment with adequate capacity. Customer
installed equipment such as suction and
discharge piping must be removed before
attempting to lift.
CAUTION!
The pump assembly can be seriously damaged
if the cables or chains used to lift and move
the unit are improperly wrapped around the
pump.
Mounting
Locate the pump in an accessible place as close
as practical to the liquid being pumped. Level
mounting is essential for proper operation.
The pump may have to be supported or
shimmed to provide for level operation or to
eliminate vibration.
Clearance
When positioning the pump, allow a minimum
clearance of 18 inches in front of the back cover
to permit removal of the cover and easy access
to the pump interior.
SUCTION & DISCHARGE PIPING
Pump performance is adversely affected by
increase suction lift, discharge elevation and
friction losses. See the performance curve and
operating range shown on Page 22 to ensure
your overall application allows pump to operate
within the safe operation range.
Materials
Either pipe or hose maybe used for suction and
discharge lines: however, the materials must
be compatible with liquid being pumped.
PRE-INSTALLATION INSPECTION

8
If hose is used in suction lines, it must be the
rigid-wall, reinforced type to prevent collapse
under suction. Using piping couplings in suction
lines is not recommended.
Line Configuration
Keep suction and discharge lines as straight
as possible to minimize friction losses. Make
minimum use of elbows and fittings, which
substantially increase friction loss. If elbows are
necessary, use the long radius type to minimize
friction loss.
Connections to Pump
Before tightening a connecting flange, align it
exactly with the pump port. Never pull a pipe
line into place by tightening the flange bolts
and/or couplings.
Lines near the pump must be independently
supported to avoid strain on the pump which
could cause excessive vibration, decrease
bearing life, and increased shaft and seal wear.
If hose-type lines are used, they should have
adequate support to secure them when filled
with liquid and under pressure.
Gauges
Most pumps are drilled and tapped for installing
dischargepressureandvacuumsuctiongauges.
If these gauges are desired for pumps that
are not tapped, drill and tap the suction and
discharge lines not less than 18 inches from
the suction and discharge ports and install the
lines. Installation closer to the pump may result
in erratic readings.
SUCTION LINES
To avoid air pockets which could affect pump
priming, the suction line must be as short and
direct as possible. When operation involves a
suction lift, the line must always slope upward
to the pump from the source of the liquid being
pumped. If the line slopes down to the pump
at any point along the suction run, air pockets
will be created.
Fittings
Suction lines should be the same size as the
pumpinlet. Ifreducersareusedinsuctionlines,
they should be the eccentric type, and should
be installed with the flat part of the reducers
uppermost to avoid creating air pockets. Valves
are not normally used in suction lines, but if a
valve is used, install it in a manner to avoid air
pockets.
Strainers
If a strainer is furnished with the pump, be
certain to use it. Any spherical solids which
pass through a strainer furnished with the
pump will also pass through the pump itself.
If a strainer is not furnished with the pump, but
is installed by the pump user, make certain that
the total area of the openings in the strainer is
at least three or four times the cross section of
the suction line, and that the openings will not
permit passage of solids larger than the solids
handling capability of the pump.
This pump is designed to handle up to 3-inch
(3”) diameter spherical solids.
Sealing
Since even a slight leak will affect priming,
head, and capacity, especially when operating
with a high suction lift, all connections in the
suction line should be sealed with pipe dope
to ensure an airtight seal. Follow the sealant
manufacturer’s recommendations when
selecting and applying the pipe dope. The
pipe dope should be compatible with the liquid
being pumped.
Suction Lines in Sumps
If a single suction line is installed in a sump,
it should be positioned away from the wall of
the sump at a distance equal to 1-½ times the
diameter of the suction line.
If there is a liquid flow from an open pipe into
the sump, the flow should be kept away from
the suction inlet because the inflow will carry
air down into the sump, and air entering the
suction line will reduce pump efficiency.

9
If it’s necessary to position inflow close to the
suction line, install a baffle between the inflow
and the suction line. The baffle will allow
entrained air to escape from the liquid before
it is drawn into the suction inlet.
If two suction lines are installed in a single
sump, the flow paths may interact, reducing
the efficiency of one or both pumps. To avoid
this, position the suction inlets so that they
are separated by a distance equal to at least 3
times the diameter of the suction pipe.
DISCHARGE LINES
Siphoning
Do not terminate the discharge line at a level
lower than of the liquid being pumped unless a
siphon breaker is used in the line. Otherwise, a
siphoning action causing damage to the pump
could result.
Suction Line Positioning
The depth of submergence of the suction line
is critical to efficient pump operation. Figure 2
shows recommended minimum submergence
vs. velocity.
NOTE:
Thepipesubmergencerequiredmaybereduced
by installing a standard pipe increaser fitting at
the end of the suction line. The larger opening
size will reduce the inlet velocity. Calculate
the required submergence using the following
formula based on the increased opening size
(area or diameter).
Valves
If a throttling valve is desired in the discharge
line, use a valve as large as the largest pipe
to minimize friction losses. Never install a
throttling valve in a suction line.
With high discharge heads, it is recommended
that a throttling valve and a system check valve
be installed in the discharge line to protect
the pump from excessive shock pressure and
reverse rotation when it is stopped.

10
CAUTION!
If the application involves a high discharge
head, gradually close the discharge throttling
valve before stopping the pump.
Bypass Lines
Self-priming pumps are not air compressors.
During the priming cycle, air from the suction
line must be vented to atmosphere on the
discharge side. If the discharge line is open,
and a check valve has been installed in the
discharge line, the discharge side of the pump
must be opened to atmospheric pressure
through a bypass line installed between the
pump discharge an the check valve. A self-
priming centrifugal pump will not prime if
there is sufficient static liquid head to hold the
discharge check valve closed.
NOTE:
The bypass line should be sized so that it does
not affect pump discharge capacity; however,
the bypass line should be at least 1 inch in
diameter to minimize the chance of plugging.
In LOW discharge head applications (less than
30 feet or 9 meters), it is recommended that
the bypass line be run back to the wet well, and
locate 6 inches below the water level or cut-off
point of the level pump. In some installations,
this bypass line may be terminated with a six-
to-eightfootlengthof1-¼inchIDsmooth-bore
hose; air and liquid vented during the priming
process will then agitate the hose and break up
any solids, grease, or other substances likely to
cause clogging.
CAUTION!
A bypass line that is returned to a wet well
must be secured against being drawn into the
pump suction inlet.
It is also recommended that pipe unions be
installed at each 90º elbow in a bypass line to
ease disassembly and maintenance.
In HIGH discharge head applications (more
than30feet),anexcessiveamountofliquidmay
be bypassed and forced back to the wet well
under the full working pressure of the pump;
this will reduce overall pumping efficiency.
Therefore, it is recommended that a All Prime
Automatic Air Release Valve be installed in the
bypass line.
All Prime Automatic Air Release Valves are
reliable, and require minimum maintenance.
See AUTOMATIC AIR RELEASE VALVE in this
section for installation and theory of operation
of the Automatic Air Release Valve. Contact All
Prime Pumps for selection of an Automatic Air
Release Valve to fit your application.
Iftheinstallationinvolvesafloodedsuctionsuch
as below-ground lift station - A pipe union and
manual shut-off valve may be installed in the
bleed line to allow service of the valve without
shutting down the station, and to eliminate
the possibility of flooding. If a manual shut-off
valve is installed anywhere in the air release
piping, it must be a full-opening ball type valve
to prevent plugging by solids.
DANGER!
If a manual shut-off valve is installed in a
bypass line, it must not be left closed during
operation. A closed manual shut-off valve may
cause a pump which has lost prime to continue
to operate without reaching prime, causing
dangerous overheating and possible explosive
rupture of the pump casing. Personnel could
be severely injured.
Allow an over-heated pump to cool before
servicing. Do not remove plates, covers,
gauges, or fittings from an overheated pump.
Liquid within the pump can reach boiling
temperatures, and vapor pressure within the
pump can cause parts being disengaged to be
ejected with great force. After the pump cools,
drain the liquid from the pump by removing the
casing drain plug. Use caution when removing
the plug to prevent injury to personnel from
hot liquid.

11
AUTOMATIC AIR RELEASE VALVE
When properly installed and correctly adjusted
to the specific hydraulic operating conditions
of the application, the All Prime Automatic Air
Release Valve will permit air to escape through
the bypass line, and then close automatically
when the pump is fully primed and pumping at
full capacity.
Theory of Operation
Figures 3 and 4 show a cross-sectional view
of the Automatic Air Release Valve, and a
corresponding description of operation.
Figure 3. Valve in Open Position
During the priming cycle, air from the pump
casing flows through the bypass line, and
passes through the Air Release valve to the
wet well Figure 3.
Figure 4. Valve in Closed Position
When the pump is fully primed, pressure
resulting from flow against the valve diaphragm
compresses the spring and closes the valve
Figure 4.
The valve will remain closed, reducing the
bypass of liquid to 1 to 5 gallons per minute,
until the pump loses prime or stops.
WARNING!
Some leakage (1 to 5 gallons per minute) will
occur when the valve is fully closed. Be sure
the bypass line is directed back to the wet well
or tank to prevent hazardous spills.
When the pump shuts down, the spring returns
thediaphragmtoitsoriginalposition. Anysolids
that may have accumulated in the diaphragm
chamber settle to the bottom and are flushed
out during the next priming cycle.
NOTE:
The valve will remain open if the pump does
not reach its designed capacity or head. Valve
closingpressureisdependentuponthedischarge
head of the pump at full capacity. The range of
the valve closing pressure is established by the
tension rate of the spring as ordered from the
factory. Valve closing pressure can be further
adjusted to the exact system requirements by
moving the spring retaining pin up or down the
plunger rod to increase or decrease tension on
the spring. Contact your All Prime distributor
or All Prime Pumps for information about an
Automatic Air Release Valve for your specific
application.
Air Release Valve Installation
The Automatic Air Release Valve must be
independently mounted in a horizontal position
and connected to the discharge line of the self-
priming centrifugal pump. See Figure 5 on
next page.
NOTE:
If the Air Release Valve is to be installed on a
staged pump application, contact the factory
for specific installation instructions.

12
The valve inlet must be installed between the
pump discharge port and the non-pressurized
side of the discharge check valve. The valve
inlet is it at the large end of the valve body,
and is provided with standard 1-inch NPT pipe
threads.
The valve outlet is located at the opposite end
of the valve, and is also equipped with standard
1-inch NPT pipe threads. The outlet should be
connected to a bleed line which slopes back to
the wet well or sump. The bleed line must be
the same size as the inlet piping, or larger. If
piping is used for the bleed line, avoid the use
of elbows whenever possible.
NOTE:
It is recommended that each Air Release
Valve be fitted with an independent bleeder
line directed back to the wet well. However,
if multiple air Release Valves are installed in a
system, the bleeder lines may be directed to a
common manifold pipe. Contact your All Prime
distributor or All Prime Pumps for information
about installation of an Automatic Air Release
Valve for your specific application.
ALIGNMENT
The alignment of the pump and its power
source is critical for trouble-free mechanical
operation. Ineithera flexible-couplingorV-belt
driven system, the driver and pump must be
mounted so that their shafts are aligned with
and parallel to each other. It is imperative
that alignment be checked after the pump and
piping are installed, and before operation.
NOTE:
Check ‘Rotation, Section C’, before alignment
of the pump. (page 15)
When mounted at All Prime Pumps, the driver
and pump are aligned before shipment.
Misalignmentmayoccur intransitand handling.
Pumps must not be operated prior to checking
alignment. The pump casing-feet and/or
pedestal-feet, and the driver mounting bolts
should also be tightly secured.
Figure 5. Typical Automatic Air Release Valve Installation

13
calipers
Figure 6A. Aligning Spider Type Couplings
WARNING!
When checking alignment, disconnect the
power source to ensure that the pump will
remain inoperative.
CAUTION!
Adjusting the alignment in one direction may
alter the alignment in another direction. Check
each procedure after altering alignment.
Coupled Drives
When using couplings, the axis of the power
source must be aligned with the axis of the
pump shaft in both the horizontal and vertical
planes. Most couplings require a specific gap or
clearance between the driving and the driven
shafts. Refer to the coupling manufacturer’s
service literature.
Align spider insert type couplings by using
calipers to measure the dimensions on the
circumference of the outer ends of the coupling
hub every 90 degrees. The coupling is in
alignment when the hub ends are the same
distance apart at all points. (see Figure 6A)
Alignnon-spidertypecouplingsbyusingafeeler
gauge or taper gauge between the coupling
halves every 90 degrees. The coupling is in
alignmentwhen the hubsare the samedistance
apart at all points. (see Figure 6B)
Figure 6B. Aligning Non-Spider Type Couplings
Check parallel adjustment by laying a
straightedge across both coupling rims at the
top, bottom, and side. When the straightedge
rests evenly on both halves of the coupling, the
coupling is in horizontal & parallel alignment.
If the coupling is misaligned use a feeler gauge
between the coupling and the straightedge to
measure the amount of misalignment.
(see Figure 6C)
Figure 6C. Aligning Non-Spider Type Couplings

14
WRONG WRONG CORRECT
MISALIGNED: SHAFTS MISALIGNED: SHAFTS ALIGNED: SHAFTS PARALLEL
NOT PARALLEL NOT IN LINE AND SHEAVES IN LINE
Figure 6D. Alignment of V-Belt Driven Pumps
DANGER!
Do not operate the pump without the guard in
place over the rotating parts. Exposed rotating
parts can catch clothing, fingers, or tools,
causing severe injury to personnel.
Tighten the belts in accordance with the belt
manufacturer’s instructions. If the belts are too
loose, they will slip; if the belts are too tight,
there will be excessive power loss and possible
bearing failure. Select pulleys that will match
theproperspeedratio; overspeeding the pump
may damage both pump and power source.
V-Belt Drives
When using V-belt drives, the power source and the pump must be parallel. Use a straightedge
along the sides of the pulleys to ensure that the pulleys are properly aligned (see Figure 6D). In
drive systems using two or more belts, make certain that the belts are a matched set; unmatched
sets will cause accelerated belt wear.

15
OPERATION – SECTION C
Review all SAFETY information in Section A.
Follow instructions on all tags, labels and decals
attached to the pump.
WARNING!
This pump is designed to handle mild industrial
corrosives, mud or slurries containing large
entrained solids. Do not attempt to pump
volatile; corrosive, or flammable liquids which
may damage the pump or endanger personnel
as a result of pump failure.
CAUTION!
Pump speed and operating conditions must be
within the performance range shown on Page
22.
PRIMING
Install the pump and piping as describe in
INSTALLATION. Make sure that the piping
connections are tight, and that the pump
is securely mounted. Check that the pump
is properly lubricated (see LUBRICATION in
MAINTENANCE AND REPAIR).
CAUTION!
Never operate this pump unless there is liquid
in the pump casing. The pump will not prime
when dry. Extended operation of a dry pump
will destroy the seal assembly.
Add liquid to the pump casing when:
1. The pump is being put into service for the
first time.
2. The pump has not been used for a
considerable length of time.
3. The liquid in the pump casing has
evaporated.
Once the pump casing has been filled, the
pump will prime and reprime as necessary.
WARNING!
After filling the pump casing, reinstall and
tighten the fill plug. Do not attempt to
operate the pump unless all connecting piping
is securely installed. Otherwise, liquid in the
pump forced out under pressure could cause
injury to personnel.
To fill the pump, remove the ‘fill-cover’ in the
top of the casing, and add clean liquid until the
casing is filled. Replace the fill-cover before
operating the pump.
STARTING
Consult the operations manual furnished with
the power source.
Rotation
The correct direction of pump rotation is:
counter-clockwise - from impeller ‘end’
-or- clockwise - from drive ‘end’
(see ‘arrow’ photos below)
The pump will be damaged by incorrect
rotation. If pump performance is not within
the specified limits (see curve Page 22), check
the direction of power source rotation before
further troubleshooting.
Remove v-belts, couplings, or otherwise
disconnect the pump from the motor before
checking motor rotation. Operate the motor
independently while observing the direction of
the motor shaft, or cooling fan.
Rotation Arrows
drive ‘end’

16
If rotation is incorrect on a three-phase motor,
have a qualified electrician interchange any
of the phase wires to change direction. If
rotation is incorrect on a single-phase motor,
consult the literature supplied with the motor
for specific instructions.
OPERATION
Lines With a Bypass
If an All Prime Automatic Air Release Valve
has been installed, the valve will automatically
open to allow the pump to prime, and
automatically close after priming is complete
(see INSTALLATION for Air Release Valve
operation.
Lines Without a Bypass
Open all valves in the discharge line and start
the power source. Priming is indicated by a
positive reading on the discharge pressure
gauge or by a quieter operation. The pump
maynot primeimmediately because thesuction
line must first fill with liquid. If the pump fails
to prime within five minutes, stop it and check
the suction line for leaks.
After the pump has been primed, partially close
the discharge line throttling valve in order to
fill the line slowly and guard against excessive
shock pressure which could damage pipe ends,
gaskets, etc. connected to the line. When the
discharge line is completely filled, adjust the
throttling valve to the required flow rate.
WARNING!
Do not operate the pump against a closed
discharge throttling valve for long periods of
time. If operated against a closed discharge
throttling valve, pump components will
deteriorate, and the liquid could come to a boil,
build pressure, and cause the pump casing to
rupture or explode.
Leakage
No leakage should be visible at pump mating
surfaces, or at pump connections or fittings.
Keep all line connections and fittings tight to
maintain maximum pump efficiency.
Liquid Temperature & Overheating
The maximum liquid temperature for this pump
is 160º F (71º C). Do not apply it at a higher
operating temperature.
Overheating can occur if operated with the
valves in the suction or discharge lines closed.
Operating against closed valves could bring the
liquid to a boil, build pressure, and cause the
pump to rupture or explode. If overheating
occurs, stop the pump and allow it to cool
before servicing it. Refill the pump casing with
cool liquid.
DANGER!
Allow an over-heated pump to cool before
servicing. Do not remove plates, covers,
gauges, or fittings from an overheated pump.
Liquid within the pump can reach boiling
temperatures, and vapor pressure within the
pump can cause parts being disengaged to be
ejected, with great force. After the pump cools,
drain the liquid from the pump by removing the
casing drain plug. Use caution when removing
the plug to prevent injury to personnel from
hot liquid.
As safeguard against rupture or explosion due
to heat, this pump is equipped with a pressure
relief valve which will open if vapor pressure
within the pump casing reaches a critical point.
If overheating does occur, stop the pump
immediatelyandallow ittocoolbeforeservicing
it. Approach any overheated pump cautiously.
It is recommended that the pressure relief
valve assembly be replaced at each overhaul,
or any time the pump casing overheats and
activates the valve. Never replace this valve
with a substitute which has not been specified
or provided by All Prime Pumps.

17
Strainer Check
If a suction strainer has been shipped with
the pump or installed by the user, check the
strainer regularly, and clean it as necessary.
The strainer should also be checked if pump
flow rate begins to drop. If a vacuum suction
gauge has been installed, monitor and record
the readings regularly to detect strainer
blockage.
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage.
This could result in personal injury or damage
to the equipment. If back flushing is absolutely
necessary, liquid pressure must be limited to
50% of the maximum permissible operating
pressure show on the pump performance
curve.
Pump Vacuum Check
With the pump inoperative, install a vacuum
gauge in the system, using pipe dope on the
threads. Block the suction line and start the
pump. At operating speed the pump should
pull a vacuum of 20 inches or more of mercury.
If it does not, check for air leaks in the seal,
gasket, or discharge valve.
Open the suction line, and read the vacuum
gauge with the pump primed and at operation
speed. Shut off the pump. The vacuum gauge
reading will immediately drop proportionate
to static suction lift, and should then stabilize.
If the vacuum reading falls off rapidly after
stabilization, an air leak exists. Before checking
for the source of the leak, check the point of
installation of the vacuum gauge.
STOPPING
Never stop the flow of liquid suddenly. If
the liquid being pumped is stopped abruptly,
damaging shock waves can be transmitted
to the pump and piping system. Close all
connecting valves slowly.
On engine driven pumps, reduce the throttle
speed slowly and allow the engine to idle briefly
before stopping.
CAUTION!
If the application involves a high discharge
head, gradually close the discharge throttling
valve before stopping the pump.
After stopping the pump, lock out or disconnect
the power source to ensure that the pump will
remain inoperative.
WARNING!
Do not operate the pump against a closed
discharge throttling valve for long periods of
time. If operated against a closed discharge
throttling valve, pump components will
deteriorate, and the liquid could come to a boil,
build pressure, and cause the pump casing to
rupture or explode.
Cold Weather Preservation
In below freezing conditions, drain the pump to
prevent damage from freezing. Also, clean out
any solids by flushing with a hose. Operate the
pump for approximately one minute; this will
remove any remaining liquid that could freeze
the pump rotating parts. If the pump will be
idle for more than a few hours, or if it has been
pumping liquids containing a large amount of
solids, drain the pump, and flush it thoroughly
with clean water. To prevent large solids from
clogging the drain port and preventing the
pump from completely draining, insert a rod
or stiff wire in the drain port, and agitate the
liquid during the draining process. Clean out
any remaining solids by flushing with a hose.

18
BEARING TEMPERATURE CHECK
Bearings normally run at higher than ambient
temperatures because of heat generated by
friction. Temperatures up to 160º F (71º C)
are considered normal for bearings, and they
can operate safely to at least 180º F (82º C).
Checking bearing temperatures by hand is
inaccurate. Bearing temperatures can be
measured accurately by placing a contact-type
thermometer against the housing. Record this
temperature for future reference.
A sudden increase in bearing temperature is a
warning that the bearings are at the point of
failing to operate properly. Make certain that
the bearing lubricant is of the proper viscosity
and at the correct level (see LUBRICATION in
MAINTENANCE AND REPAIR).
Bearing overheating can also be caused by
shaft misalignment and/or excessive vibration.
When pumps are first started, the bearings
may seem to run at temperatures above
normal. Continued operation should bring the
temperatures down to normal levels.

19
TROUBLESHOOTING - SECTION D
Review all SAFETY information in Section A.
WARNING!
Before attempting to open or service the pump:
1. Familiarize yourself with this manual.
2. Lock out or disconnect the power source to ensure that the pump will remain inoperative.
3. Allow the pump to cool if overheated.
4. Check the temperature before opening any covers, plates, or plugs.
5. Close the suction and discharge valves.
6. Vent the pump slowly and cautiously.
7. Drain the pump.
TROUBLE
PUMP FAILS
TO PRIME
POSSIBLE CAUSE
Not enough liquid in casing.
Suction check valve contaminated
or damaged.
Air leak in suction line.
Lining of suction hose collapsed.
Leaking or worn seal or pump
gasket.
Suction lift or discharge head too
high.
Strainer clogged.
PROBABLE REMEDY
Add liquid to casing. See PRIMING.
Clean or replace check valve.
Correct leak.
Replace suction Hose.
Check pump vacuum. Replace
leaking or worn seal or gasket.
Check piping installation and
install bypass line if needed. See
INSTALLATION.
Check strainer and clean if
necessary.

20
TROUBLE
PUMP STOPS OR
FAILS TO DELIVER
RATED FLOW OR
PRESSURE
POSSIBLE CAUSE
Air leak in suction line.
Lining of suction hose collapsed.
Leaking or worn seal or pump gasket.
Strainer clogged.
Suction intake not submerged at
proper level or sump too small.
Impeller or other wearing parts worn
or damaged.
Impeller clogged.
Pump speed too slow.
Discharge head too high.
Suction lift too high.
PROBABLE REMEDY
Correct leak.
Replace suction hose.
Check pump vacuum. Replace leaking or
worn seal or gasket.
Check strainer and clean if necessary.
Check installation and correct
submergence as needed.
Replace worn or damaged parts. Check
that impeller is properly centered and
rotates.
Free impeller of debris.
Check driver output; check belts or
couplings for slippage.
Install bypass line.
Measure lift w/vacuum gauge. Reduce
lift and/or friction losses in suction line.
PUMP REQUIRES
TOO MUCH POWER Pump speed too high
Discharge head too low.
Liquid solution too thick.
Bearing(s) frozen.
Check driver output; check that sheaves
or motor rpm are correctly sized.
Adjust discharge valve.
Dilute if possible.
Disassemble pump and check
bearing(s).
PUMP CLOGS
FREQUENTLY Liquid solution too thick.
Discharge flow too slow.
Suction check valve or foot valve
Clogged or binding.
Dilute if possible.
Open discharge valve fully to increase
flow rate, and run power source at
maximum governed speed.
Clean valve.